Are you aware that their music is not based on wave files, but on midi? You can find those midi files in the files with ".001" extension. There open LFLF, SOUN, SOU. In DOTT there are always three version, ROL (Roland), ADL (Adlib) and GMD (General Midi). You may have trouble playing them from SCUMM Revisited, but saving and then playing should work. There may be another problem:
iMuse. That means that there will be several layers of music on top of each other which you would have to rearrange.

yeah, i knew they're midi based, and i eventually found the music files, but they sound kind of strange even when i save them to a new folder. Ah well, does anyone know when Imuse Island is reopening (if they are at all?)